def get_key_bydict(a):
    key=""
    for k,v in a.items():

        if k in ["=",">","<","<=",">=","!="]:
            key = key + k
            if isinstance(v, dict):
                r = get_key_bydict(v)
            else:
                r = str(v)
            key = key + r
        else:
            key=key+"_"+k
            if isinstance(v, dict):
                r = get_key_bydict(v)
                key = key + r
            else:
                r = str(v)
                key = key + "_" + r
    return key
